=> Fit into the Tune In/actiTube wooden pipes. Also ideal for screwing in. Feels almost like a normal tip with a diameter of 9 mm. Makes the smoke pleasantly cool and filters harmful substances, without "losses" :) For all critics, the filter weighs before and after smoking. Dont worry, nothing changes the effect. ActiTube, take the damage out of the fabric. Box contents: 2 boxes, 1 box = 100 filters